High arch foot, as the name implies, refers to the lateral view of the high arch of the foot, which loses elasticity during walking or weight-bearing and cannot be relatively flattened, thus unable to complete normal standing and walking functions. Due to the change of the arch and the loss of elasticity, the force parts of the foot during walking are located in the forefoot toes and hindfoot heel, and some patients with severe deformity also have a combination of foot inversion resulting in the force of the foot being located in the lateral edge of the foot. Long-term changes in the position of the force may cause callus formation and pain at the force area, and may also cause fatigue during standing or walking due to the change in the mechanical environment of the lower limb. In severe cases, degeneration of the ankle joint or even the knee joint may occur. Diagnosis: High arched feet can be caused by different diseases, but they are all characterized by neuromuscular disorders that cause abnormal muscle strength in the lower extremities, resulting in an imbalance in the strength of the muscles governing the medial and lateral aspects of the foot, which in turn leads to the appearance of foot deformities. Diseases such as progressive peroneal muscular atrophy, spinal cord embolism syndrome, and post-polio may cause the appearance of high arched feet. High arched foot is easy to diagnose because it is a description of a foot deformity, but for the treatment of the disease, it is necessary to identify the underlying cause of the high arched foot. The progression of the disease varies from one condition to another, and some conditions may progress further, so an evaluation by a professional physician is required to develop the most reasonable and effective treatment plan. During the diagnostic process, a weight-bearing frontal view of the foot and an axial view of the heel are taken. The weight-bearing frontal view of the foot is used to measure the degree of arch deformity under stress. The heel axis is used to measure the degree of hindfoot valgus deformity. In some patients, CT is required to further define the degree of deformity and adjacent joint involvement, and in some patients, electromyography is required to define the original cause. Treatment: Patients with early mild high arched foot may try to wear a brace and be treated conservatively with close observation. The principle of surgical treatment for high arched foot is “balance muscle strength, correct deformity,” mainly focusing on the correction of deformity, so that the patient can obtain a foot shape as close to normal as possible to adapt to the function of standing and walking. At the same time, since the cause of high arched foot is the imbalance of muscle strength in the lower limbs, one of the keys to treatment is to balance the muscle strength, which requires some soft tissue surgery (soft tissue surgery includes tendon release, tendon transposition and tendon reconstruction, etc.). Each patient’s soft tissue surgery requires a careful preoperative evaluation and surgical plan, as the soft tissue deformity varies greatly from patient to patient and requires a physical evaluation by a specialized orthopedic surgeon. The correction of bony deformity includes osteotomy or fusion. For patients with mild deformity and no joint damage, osteotomy can be considered, while for patients with large deformity and joint surface damage, joint fusion can be considered to correct the deformity at the same time. High arched foot is one of the common deformities of the foot, which seriously affects the patient’s standing and walking functions, and in some cases is progressively worse. High arched foot is not an untreatable disease. As long as the type of the original disease is correctly determined, the type and degree of deformity is accurately evaluated, and reasonable treatment choices are made, patients can improve their deformity and thus improve their quality of life. The treatment of each patient is different because of different deformities, so consultation and treatment by a professional orthopedic surgeon is a guarantee that the patient will obtain a satisfactory outcome.